Hi folks, In this tutorial, We are going to learn What is Constructor in C#? A Constructor is a special type of method which is invoked when we create an instance of the class.
What is Constructor in C#?
A Constructor is a special type of method which is invoked when we create an instance of the class. It has the same name as the class name. A constructor does not have any return type not even void. It is used to assign the initial value to the data member of the class.
For Example, If I have a class called MyClass then the Constructor of the class is created as follows,
public class MyClass
{
public MyClass()
{
//Constructor
}
}
In the above code snippet, we have a class called MyClass and the constructor of this class is created with the same as the class name.
Types of Constructor:
There are following types of Constructor in C#.
- Default Constructor.
- Parameterized Constructor.
- Copy Constructor.
- Private Constructor.
- Static Constructor.
We will discuss Default and Parameterized Constructor in this tutorial. Rest of the types we will discuss in next sessions.
Default Constructor:
A constructor with no parameters is called a default constructor. The default constructor initializes all numeric fields to zero and all string and object fields to null inside a class.
using System;
public class Student
{
public Student()
{
Console.WriteLine("Default Constructor Invoked");
}
}
class TestStudent{
public static void Main(string[] args)
{
Student objStudent1 = new Student();
Student objStudent2 = new Student();
}
}
Output:
Default Constructor Invoked Default Constructor Invoked
Parameterized Constructor:
A Constructor with at least one parameter is called Parameterized Constructor. It can initialize each instance of the class to new values.
using System;
public class Student
{
public int _iRollNo;
public String _sName;
public Student(int iRollNo, String sName)
{
_iRollNo = iRollNo;
_sName = sName;
}
public void DisplayRecord()
{
Console.WriteLine("Roll No " + " " + _iRollNo + ". Name " + _sName);
}
}
class Program
{
static void Main(string[] args)
{
Student objStudent = new Student(1,"Vinod");
Student objStudent1 = new Student(2, "Ansh");
objStudent.DisplayRecord();
objStudent1.DisplayRecord();
Console.ReadLine();
}
}
Output:
Roll No 1. Name Vinod Roll No 2. Name Ansh
Point Of Interest for Constructor:
- A constructor has the same name as the class name.
- A constructor doesn’t have the return type not even void.
- A class can have any number of the constructor.
- A constructor cannot be declared as abstract final.
- A static constructor cannot be parameterized.
View More:
Conclusion:
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Thank You.
